| 1 |
mlosch |
1.15 |
C $Header: /u/gcmpack/MITgcm/pkg/seaice/seaice_calc_strainrates.F,v 1.14 2009/06/24 08:23:38 mlosch Exp $ |
| 2 |
mlosch |
1.1 |
C $Name: $ |
| 3 |
|
|
|
| 4 |
|
|
#include "SEAICE_OPTIONS.h" |
| 5 |
|
|
|
| 6 |
|
|
CStartOfInterface |
| 7 |
jmc |
1.8 |
SUBROUTINE SEAICE_CALC_STRAINRATES( |
| 8 |
mlosch |
1.1 |
I uFld, vFld, |
| 9 |
mlosch |
1.12 |
O e11Loc, e22Loc, e12Loc, |
| 10 |
mlosch |
1.14 |
I iStep, myTime, myIter, myThid ) |
| 11 |
mlosch |
1.1 |
C /==========================================================\ |
| 12 |
|
|
C | SUBROUTINE SEAICE_CALC_STRAINRATES | |
| 13 |
|
|
C | o compute strain rates from ice velocities | |
| 14 |
|
|
C |==========================================================| |
| 15 |
|
|
C | written by Martin Losch, Apr 2007 | |
| 16 |
|
|
C \==========================================================/ |
| 17 |
|
|
IMPLICIT NONE |
| 18 |
|
|
|
| 19 |
|
|
C === Global variables === |
| 20 |
|
|
#include "SIZE.h" |
| 21 |
|
|
#include "EEPARAMS.h" |
| 22 |
|
|
#include "PARAMS.h" |
| 23 |
|
|
#include "GRID.h" |
| 24 |
|
|
#include "SEAICE_PARAMS.h" |
| 25 |
mlosch |
1.11 |
#include "SEAICE.h" |
| 26 |
mlosch |
1.1 |
|
| 27 |
|
|
#ifdef ALLOW_AUTODIFF_TAMC |
| 28 |
|
|
# include "tamc.h" |
| 29 |
|
|
#endif |
| 30 |
|
|
|
| 31 |
|
|
C === Routine arguments === |
| 32 |
jmc |
1.8 |
C iStep :: Sub-time-step number |
| 33 |
|
|
C myTime :: Simulation time |
| 34 |
|
|
C myIter :: Simulation timestep number |
| 35 |
|
|
C myThid :: My Thread Id. number |
| 36 |
|
|
INTEGER iStep |
| 37 |
|
|
_RL myTime |
| 38 |
|
|
INTEGER myIter |
| 39 |
mlosch |
1.1 |
INTEGER myThid |
| 40 |
|
|
C ice velocities |
| 41 |
mlosch |
1.14 |
_RL uFld (1-Olx:sNx+Olx,1-Oly:sNy+Oly,nSx,nSy) |
| 42 |
|
|
_RL vFld (1-Olx:sNx+Olx,1-Oly:sNy+Oly,nSx,nSy) |
| 43 |
mlosch |
1.1 |
C strain rate tensor |
| 44 |
mlosch |
1.12 |
_RL e11Loc (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
| 45 |
|
|
_RL e22Loc (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
| 46 |
|
|
_RL e12Loc (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
| 47 |
mlosch |
1.1 |
CEndOfInterface |
| 48 |
|
|
|
| 49 |
|
|
#ifdef SEAICE_CGRID |
| 50 |
|
|
#ifdef SEAICE_ALLOW_DYNAMICS |
| 51 |
|
|
C === Local variables === |
| 52 |
|
|
C i,j,bi,bj - Loop counters |
| 53 |
|
|
INTEGER i, j, bi, bj |
| 54 |
mlosch |
1.15 |
C hFacU, hFacV - determine the no-slip boundary condition |
| 55 |
mlosch |
1.2 |
INTEGER k |
| 56 |
mlosch |
1.11 |
_RS hFacU, hFacV, noSlipFac |
| 57 |
mlosch |
1.15 |
C auxillary variables that help writing code that |
| 58 |
|
|
C vectorizes even after TAFization |
| 59 |
|
|
_RL dudx (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 60 |
|
|
_RL dvdy (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 61 |
|
|
_RL dudy (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 62 |
|
|
_RL dvdx (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 63 |
|
|
_RL uave (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 64 |
|
|
_RL vave (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 65 |
mlosch |
1.2 |
|
| 66 |
mlosch |
1.4 |
k = 1 |
| 67 |
mlosch |
1.11 |
noSlipFac = 0. _d 0 |
| 68 |
|
|
IF ( SEAICE_no_slip ) noSlipFac = 1. _d 0 |
| 69 |
mlosch |
1.1 |
C |
| 70 |
mlosch |
1.11 |
#ifndef SEAICE_OLD_AND_BAD_DISCRETIZATION |
| 71 |
|
|
DO bj=myByLo(myThid),myByHi(myThid) |
| 72 |
|
|
DO bi=myBxLo(myThid),myBxHi(myThid) |
| 73 |
mlosch |
1.15 |
C abbreviations on C-points, need to do them in separate loops |
| 74 |
|
|
C for vectorization |
| 75 |
mlosch |
1.11 |
DO j=1-Oly,sNy+Oly-1 |
| 76 |
|
|
DO i=1-Olx,sNx+Olx-1 |
| 77 |
mlosch |
1.15 |
dudx(I,J) = _recip_dxF(I,J,bi,bj) * |
| 78 |
mlosch |
1.14 |
& (uFld(I+1,J,bi,bj)-uFld(I,J,bi,bj)) |
| 79 |
mlosch |
1.15 |
uave(I,J) = 0.5 _d 0 * (uFld(I,J,bi,bj)+uFld(I+1,J,bi,bj)) |
| 80 |
|
|
ENDDO |
| 81 |
|
|
ENDDO |
| 82 |
|
|
DO j=1-Oly,sNy+Oly-1 |
| 83 |
|
|
DO i=1-Olx,sNx+Olx-1 |
| 84 |
|
|
dvdy(I,J) = _recip_dyF(I,J,bi,bj) * |
| 85 |
mlosch |
1.14 |
& (vFld(I,J+1,bi,bj)-vFld(I,J,bi,bj)) |
| 86 |
mlosch |
1.15 |
vave(I,J) = 0.5 _d 0 * (vFld(I,J,bi,bj)+vFld(I,J+1,bi,bj)) |
| 87 |
|
|
ENDDO |
| 88 |
|
|
ENDDO |
| 89 |
|
|
C evaluate strain rates at C-points |
| 90 |
|
|
DO j=1-Oly,sNy+Oly-1 |
| 91 |
|
|
DO i=1-Olx,sNx+Olx-1 |
| 92 |
|
|
e11Loc(I,J,bi,bj) = dudx(I,J) + vave(I,J) * k2AtC(I,J,bi,bj) |
| 93 |
|
|
e22Loc(I,J,bi,bj) = dvdy(I,J) + uave(I,J) * k1AtC(I,J,bi,bj) |
| 94 |
mlosch |
1.11 |
ENDDO |
| 95 |
|
|
ENDDO |
| 96 |
mlosch |
1.15 |
C abbreviations at Z-points, need to do them in separate loops |
| 97 |
|
|
C for vectorization |
| 98 |
|
|
DO j=1-Oly+1,sNy+Oly |
| 99 |
|
|
DO i=1-Olx+1,sNx+Olx |
| 100 |
|
|
dudy(I,J) = ( uFld(I,J,bi,bj) - uFld(I ,J-1,bi,bj) ) |
| 101 |
|
|
& * _recip_dyU(I,J,bi,bj) |
| 102 |
|
|
uave(I,J) = 0.5 _d 0 * (uFld(I,J,bi,bj)+uFld(I ,J-1,bi,bj)) |
| 103 |
|
|
ENDDO |
| 104 |
|
|
ENDDO |
| 105 |
|
|
DO j=1-Oly+1,sNy+Oly |
| 106 |
|
|
DO i=1-Olx+1,sNx+Olx |
| 107 |
|
|
dvdx(I,J) = ( vFld(I,J,bi,bj) - vFld(I-1,J ,bi,bj) ) |
| 108 |
|
|
& * _recip_dxV(I,J,bi,bj) |
| 109 |
|
|
vave(I,J) = 0.5 _d 0 * (vFld(I,J,bi,bj)+vFld(I-1,J ,bi,bj)) |
| 110 |
|
|
ENDDO |
| 111 |
|
|
ENDDO |
| 112 |
|
|
C evaluate strain rates at Z-points |
| 113 |
mlosch |
1.11 |
DO j=1-Oly+1,sNy+Oly |
| 114 |
|
|
DO i=1-Olx+1,sNx+Olx |
| 115 |
|
|
hFacU = _maskW(i,j,k,bi,bj) - _maskW(i,j-1,k,bi,bj) |
| 116 |
|
|
hFacV = _maskS(i,j,k,bi,bj) - _maskS(i-1,j,k,bi,bj) |
| 117 |
mlosch |
1.15 |
e12Loc(I,J,bi,bj) = 0.5 _d 0 * ( |
| 118 |
|
|
& dudy(I,J) + dvdx(I,J) |
| 119 |
|
|
& - k1AtZ(I,J,bi,bj) * vave(I,J) |
| 120 |
|
|
& - k2AtZ(I,J,bi,bj) * uave(I,J) |
| 121 |
mlosch |
1.11 |
& ) |
| 122 |
|
|
& *maskC(I ,J ,k,bi,bj)*maskC(I-1,J ,k,bi,bj) |
| 123 |
|
|
& *maskC(I ,J-1,k,bi,bj)*maskC(I-1,J-1,k,bi,bj) |
| 124 |
|
|
& + 2.0 _d 0 * noSlipFac * ( |
| 125 |
mlosch |
1.15 |
& 2.0 _d 0 * uave(I,J) * _recip_dyU(I,J,bi,bj) * hFacU |
| 126 |
|
|
& + 2.0 _d 0 * vave(I,J) * _recip_dxV(I,J,bi,bj) * hFacV |
| 127 |
mlosch |
1.11 |
& ) |
| 128 |
|
|
C no slip at the boundary implies u(j)+u(j-1)=0 and v(i)+v(i-1)=0 |
| 129 |
|
|
C accross the boundary; this is already accomplished by masking so |
| 130 |
|
|
C that the following lines are not necessary |
| 131 |
mlosch |
1.15 |
c$$$ & - hFacV * k1AtZ(I,J,bi,bj) * vave(I,J) |
| 132 |
|
|
c$$$ & - hFacU * k2AtZ(I,J,bi,bj) * uave(I,J) |
| 133 |
mlosch |
1.11 |
ENDDO |
| 134 |
|
|
ENDDO |
| 135 |
|
|
|
| 136 |
|
|
ENDDO |
| 137 |
|
|
ENDDO |
| 138 |
|
|
#else |
| 139 |
|
|
C this the old and incomplete discretization, here I also erroneously |
| 140 |
|
|
C used finite-volumes to discretize the strain rates |
| 141 |
mlosch |
1.1 |
DO bj=myByLo(myThid),myByHi(myThid) |
| 142 |
|
|
DO bi=myBxLo(myThid),myBxHi(myThid) |
| 143 |
mlosch |
1.5 |
DO j=1-Oly,sNy+Oly-1 |
| 144 |
|
|
DO i=1-Olx,sNx+Olx-1 |
| 145 |
|
|
C evaluate strain rates |
| 146 |
mlosch |
1.12 |
e11Loc(I,J,bi,bj) = _recip_dxF(I,J,bi,bj) * |
| 147 |
mlosch |
1.14 |
& (uFld(I+1,J,bi,bj)-uFld(I,J,bi,bj)) |
| 148 |
mlosch |
1.1 |
& -HALF* |
| 149 |
mlosch |
1.14 |
& (vFld(I,J,bi,bj)+vFld(I,J+1,bi,bj)) |
| 150 |
mlosch |
1.1 |
& * _tanPhiAtU(I,J,bi,bj)*recip_rSphere |
| 151 |
mlosch |
1.12 |
e22Loc(I,J,bi,bj) = _recip_dyF(I,J,bi,bj) * |
| 152 |
mlosch |
1.14 |
& (vFld(I,J+1,bi,bj)-vFld(I,J,bi,bj)) |
| 153 |
mlosch |
1.1 |
C one metric term is missing |
| 154 |
mlosch |
1.5 |
ENDDO |
| 155 |
|
|
ENDDO |
| 156 |
|
|
DO j=1-Oly+1,sNy+Oly |
| 157 |
|
|
DO i=1-Olx+1,sNx+Olx |
| 158 |
mlosch |
1.12 |
e12Loc(I,J,bi,bj) = HALF*( |
| 159 |
mlosch |
1.14 |
& (uFld(I ,J ,bi,bj) * _dxC(I ,J ,bi,bj) |
| 160 |
|
|
& -uFld(I ,J-1,bi,bj) * _dxC(I ,J-1,bi,bj) |
| 161 |
|
|
& +vFld(I ,J ,bi,bj) * _dyC(I ,J ,bi,bj) |
| 162 |
|
|
& -vFld(I-1,J ,bi,bj) * _dyC(I-1,J ,bi,bj)) |
| 163 |
mlosch |
1.1 |
& * recip_rAz(I,J,bi,bj) |
| 164 |
|
|
& + |
| 165 |
mlosch |
1.14 |
& 0.25 _d 0 * (uFld(I,J,bi,bj)+uFld(I ,J-1,bi,bj)) |
| 166 |
mlosch |
1.1 |
& * ( _tanPhiAtU(I,J,bi,bj) + _tanPhiAtU(I,J-1,bi,bj) ) |
| 167 |
|
|
& *recip_rSphere |
| 168 |
|
|
& ) |
| 169 |
mlosch |
1.4 |
& *maskC(I ,J ,k,bi,bj)*maskC(I-1,J ,k,bi,bj) |
| 170 |
|
|
& *maskC(I ,J-1,k,bi,bj)*maskC(I-1,J-1,k,bi,bj) |
| 171 |
mlosch |
1.1 |
C one metric term is missing |
| 172 |
|
|
ENDDO |
| 173 |
|
|
ENDDO |
| 174 |
mlosch |
1.2 |
IF ( SEAICE_no_slip ) THEN |
| 175 |
mlosch |
1.12 |
C no slip boundary conditions apply only to e12Loc |
| 176 |
mlosch |
1.5 |
DO j=1-Oly+1,sNy+Oly |
| 177 |
|
|
DO i=1-Olx+1,sNx+Olx |
| 178 |
mlosch |
1.2 |
hFacU = _maskW(i,j,k,bi,bj) - _maskW(i,j-1,k,bi,bj) |
| 179 |
|
|
hFacV = _maskS(i,j,k,bi,bj) - _maskS(i-1,j,k,bi,bj) |
| 180 |
|
|
|
| 181 |
mlosch |
1.12 |
e12Loc(I,J,bi,bj) = e12Loc(I,J,bi,bj) |
| 182 |
mlosch |
1.10 |
& + recip_rAz(i,j,bi,bj) * 2. _d 0 * |
| 183 |
mlosch |
1.14 |
& ( hFacU * ( _dxC(i,j-1,bi,bj)*uFld(i,j ,bi,bj) |
| 184 |
|
|
& + _dxC(i,j, bi,bj)*uFld(i,j-1,bi,bj) ) |
| 185 |
|
|
& + hFacV * ( _dyC(i-1,j,bi,bj)*vFld(i ,j,bi,bj) |
| 186 |
|
|
& + _dyC(i, j,bi,bj)*vFld(i-1,j,bi,bj) ) ) |
| 187 |
jmc |
1.8 |
& - hFacU |
| 188 |
mlosch |
1.14 |
& * 0.25 _d 0 * (uFld(I,J,bi,bj)+uFld(I ,J-1,bi,bj)) |
| 189 |
mlosch |
1.2 |
& * ( _tanPhiAtU(I,J,bi,bj) + _tanPhiAtU(I,J-1,bi,bj) ) |
| 190 |
|
|
& *recip_rSphere |
| 191 |
|
|
C one metric term is missing |
| 192 |
|
|
ENDDO |
| 193 |
|
|
ENDDO |
| 194 |
|
|
|
| 195 |
|
|
ENDIF |
| 196 |
mlosch |
1.1 |
ENDDO |
| 197 |
|
|
ENDDO |
| 198 |
mlosch |
1.11 |
#endif /* SEAICE_OLD_AND_BAD_DISCRETIZATION */ |
| 199 |
mlosch |
1.1 |
#endif /* SEAICE_ALLOW_DYNAMICS */ |
| 200 |
|
|
#endif /* SEAICE_CGRID */ |
| 201 |
|
|
RETURN |
| 202 |
|
|
END |
Parent Directory
| 
Revision Log
| 
Revision Graph